(Unicode C++) ScMinidriver - Find and Load Certificate from Smart Card or USB Token

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Demonstrates how to find and load a specific certificate located on a smart card or USB token.

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#include <CkScMinidriverW.h>
#include <CkCertW.h>

void ChilkatSample(void)
    {
    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    CkScMinidriverW scmd;

    // Reader names (smart card readers or USB tokens) can be discovered
    // via List Readers or Find Smart Cards
    const wchar_t *readerName = L"SCM Microsystems Inc. SCR33x USB Smart Card Reader 0";
    bool success = scmd.AcquireContext(readerName);
    if (success == false) {
        wprintf(L"%s\n",scmd.lastErrorText());
        return;
    }

    // If successful, the name of the currently inserted smart card is available:
    wprintf(L"Card name: %s\n",scmd.cardName());

    // If desired, perform regular PIN authentication with the smartcard.
    // For more details about smart card PIN authentication, see the Smart Card PIN Authentication Example
    int retval = scmd.PinAuthenticate(L"user",L"000000");
    if (retval != 0) {
        wprintf(L"PIN Authentication failed.\n");
    }

    // You can find a cerficate using any of the following certificate parts:
    // "subjectDN" -- The full distinguished name of the cert.
    // "subjectDN_withTags" -- Same as above, but in a format that includes the subject part tags, such as the "CN=" in "CN=something"
    // "subjectCN" -- The common name part (CN) of the certificate's subject.
    // "serial" -- The certificate serial number.
    // "serial:issuerCN" -- The certificate serial number + the issuer's common name, delimited with a colon char.
    // These are the same certificate parts that can be retrieved by listing certificates on the smart card (or USB token).
    // See List Certificates on Smart Card Example
    const wchar_t *certPart = L"subjectCN";
    const wchar_t *partValue = L"PIVKey E42D60A759D39147A26E0AF2FB1183C5";

    // If the certificate is found, it is loaded into the cert object.
    CkCertW cert;
    success = scmd.FindCert(certPart,partValue,cert);
    if (success == false) {
        wprintf(L"Failed to find the certificate.\n");
    }
    else {
        wprintf(L"Successfully loaded the cert object from the smart card / USB token.\n");

        // Note: When successful, the cert object is internally linked to the ScMinidriver object's authenticated session.
        // The cert object can now be used to sign or do other cryptographic operations that occur on the smart card / USB token.
        // If your application calls PinDeauthenticate or DeleteContext, the cert will no longer be able to sign on the smart card
        // because the smart card ScMinidriver session will no longer be authenticated or deleted.
    }

    // ...
    // ...
    // ...

    // When finished with operations that required authentication, you may if you wish, deauthenticate the session.
    success = scmd.PinDeauthenticate(L"user");
    if (success == false) {
        wprintf(L"%s\n",scmd.lastErrorText());
    }

    // Delete the context when finished with the card.
    success = scmd.DeleteContext();
    if (success == false) {
        wprintf(L"%s\n",scmd.lastErrorText());
    }
    }